package demo09稀疏数组;

public class Demo09稀疏数组 {
    public static void main(String[] args) {

        //1.创建一个二维数组 11*11 0：没有棋子,   1：黑棋   2，白棋

        int[][] array1 = new int[11][11];
        array1[1][2] = 1;
        array1[2][3] = 2;
        //输出原始数组
        System.out.println("输出原始的数组");
        System.out.println(array1.length);//11

        for (int[] ints : array1) {
            for (int anInt : ints) {
                System.out.print(anInt + "\t");
            }
            System.out.println();
        }
        System.out.println("============================================");

        //转化为稀疏数组保存
        //获取有效值的个数
        int sum = 0;
        for (int i = 0; i <11 ; i++) {
            for (int j = 0; j < 11; j++) {
                if(array1[i][j] != 0){
                    sum++;
                }
            }
        }
        System.out.println(sum);

        System.out.println("================================");

        //2.创建一个稀疏数组的数组
        int[][] array2 = new int[sum+1][3];

        array2[0][0] = 11;
        array2[0][1] = 11;
        array2[0][2] = sum;

        //遍历二维数组，将非零的值，存放在稀疏数组中
        int count = 0 ;
        for (int i = 0; i < array1.length ; i++) {
            for (int j = 0; j < array1[i].length; j++) {
                    if(array1[i][j] != 0){
                        count++;
                        array2[count][0] = i;               //给予第几列
                        array2[count][1] = j;               //给予第几行
                        array2[count][2] = array1[i][j];    //给与当前的值
                    }
            }
        }

        System.out.println("稀疏数组：");
        for (int i = 0; i <array2.length ; i++) {
            for (int j = 0; j <array2[i].length ; j++) {
                System.out.print(array2[i][j] + "\t");
            }
            System.out.println();
        }
        System.out.println("======================================");
        System.out.println("用增强for循环遍历出来稀疏数组：");
        for (int[] x : array2) {
            for (int anInt : x) {
                System.out.print(anInt + "\t");
            }
            System.out.println();
        }

        System.out.println("=========================");
        System.out.println("还原后的值：");
        int sum1 = 0;
        //1.读取稀疏数组
        int[][] array3 = new int[array2[0][0]][array2[0][1]];//array2[0][0]为行 arrary2[0][1]为列

        //2.给其中的元素还原它的值 因为数组有个默认值0
        for (int i = 1; i < array2.length ; i++) {
            array3[array2[i][0]][array2[i][1]] = array2[i][2];
        }

        //3.打印
        for (int[] ints : array3) {
            for (int anInt : ints) {
                System.out.print(anInt + "\t");
            }
            System.out.println();
        }


    }
}
